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Knows the composition and structure of the Earth's atmosphere.

Water Bottles, Root Beer, and Air

The common plastic water bottle makes a useful container for demonstrating properties of gases and liquids. As typical examples, we know that "air" is a gas (made up of nitrogen, oxygen, water vapor, ozone, carbon dioxide, and several "trace" gases) and water is a liquid. We should also note that gases and liquids are both "fluids". That is, they can flow or change shape, rather than having a fixed shape like a solid.

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There's Air in There!

Air pressure. Air has mass and takes up space. This is sometimes a difficult concept for kids to really understand.

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